Passive transport

Passive transport is a process in which a molecule or ion passes through a cell wall via a concentration gradient. It is also known as passive diffusion,

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Diffusion is the tendency of molecules to spread into an available space. The diffusion of substances across a membrane is called passive transport.

Passive transport is the movement of ions and molecules along the concentration gradient without the application of any external energy. Explore more at BYJU'S

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This is a one-page review of cell transport covering diffusion, osmosis, facilitated diffusion, and active transport. ...

Active vs. Passive Transport! When transport does not require energy, it’s “passive transport”. When it does require energy, it’s called “active transport”. Several transportation strategies require energy and several do not. Osmosis and diffusion are both passive transport; they do not require energy but can only move particles from higher to lower concentration. By using ATP as an energy source, we can move larger or charged particles, and move particles against the concentration gradient.

A little osmosis..in a GIF! By The Amoeba Sisters